6 - Review of Experimental Design

Match the vocabulary words to the correct definitions. Hypothesis A testable prediction Control Group that receives the "normal" conditions Independent/ Manipulated Variable The variable that the scientist changes Dependent Variable The variable that is measured Constant A condition during the experiment that stays the same for all groups being tested Observation Using your five senses to determine information Inference Drawing a conclusion using the evidence at hand Which of the following puts the steps of a scientific experiment in the correct order? 2,3,1,4 2,1,4,3 2,1,3,4 4,2,3,1 What is the purpose of an experiment? To communicate data To test a hypothesis To prove a scientific law None of these How many independent variables can their be in a controlled experiment? one two three four Global Warming Experiment Asher is concerned about global warming. He believes that much of the problem is caused by the intense heat arising from surfaces such as streets and the roofs of buildings. Asher convinces the principal of his school to run an experiment. With the help of other students, Asher raises money for a rooftop garden to be put in on one half of his school building. For one semester, Asher keeps track of the air temperature on the half of the building with the rooftop garden and the half of the building without the garden. He finds that the average temperature near the rooftop garden is 73°F. The average temperature away from the garden is 84°F. What is the manipulated variable for the Global Warming Experiment? Air Temperature Location Global Warming Time of Day What is the dependent variable for the Global Warming Experiment? Air Temperature Location Global Warming Time of Day Turtles lay eggs in holes that they dig in the ground. The temperature that eggs are incubated at determines whether the offspring are male or female. Warmer temperatures lead to more females. The normal soil temperature is 35C.Use the data table to identify the constant, control group, experimental group, IV, and DV. Based on the experiment above put the items into the correct category. Constants pH of water Sand color Wind Speed Control Group Eggs incubated at 35 C Experimental Group Eggs incubated at 25, 30, 40, and 45 C Independent variable Temperature eggs are incubated at Dependent variable Number of females hatched I notice that when I walk into the room, my parrot squawks. I think that he might squawk because he recognizes me. I test this by walking into the room and having my mom, brother, and father walk in the room at different times and record the number of squawks. We all wore the same color clothing, took the same number of steps into the room, spent the same amount of time in the room, and did not wear any perfumes. I found that my parrot only squawks when my mom and I walk into the room. These data suggest that my parrot squawks when he sees females. The control group is me.The experimental group is the rest of my family.The IV is the person walking into the roomand will be graphed on the x-axis.The DV is the number of squawksand will be graphed on the y-axis.The constants are the color of clothing, the number of steps into the room, the time spent in the room, and the lack of perfume. You are a doctor working at Kaiser. You want to test a new drug for cancer patients who are being treated in your hospital. You have 100 patients in which to test your drug. Identify the following:1. Hypothesis (If...then...)2. Experiment (what are you going to do?)3. What is the experimental group?4. What is the control group?5. Independent Variable?6. Dependent Variable?7. Three important constants: